Kinda bowling ball-ish and lloks like it was made out of wood. You can find the trophy in your list of mission accolades when setting your floor trophy. I think it says "No Kill I" in the slection menu...
Well to recieve this trophy you need the accolade "No kill I". Therefor you have to talk with the Horta during the mission "Frozen". Turn left into the room when you enter the middle room with the working romulans. Kill the Romulans and scan the hole. Than follow the way to the Horta. Defend the Horta against the Romulans. After that talk with the Horta and you will get the accolade "No kill I".
Well to recieve this trophy you need the accolade "No kill I". Therefor you have to talk with the Horta during the mission "Frozen".
Correction, that mission was titled "Mine Enemy" not "Frozen". "Frozen" was the sequential mission after "Mine Enemy", it dealt with talking to Obisek and his Reman resistance in a hidden base under threat by the Tal Shiar, with no appearance by the Horta. "Mine Enemy" is the mission where you are investigating a mining colony (full of Romulan refugees for miners, supervised by a group of Ferengi) for reports of illegal weapons, and among the way you can find the Horta there.